# Temp and kinetic th

#### Dx

[SOLVED] temp and kinetic th

Hiya!
Just 2 quick questions that i may ask which will help me solve for my problems i am working on.

1) In order to double the avg speed of molecules in a simple gas, the temp(in K) must be double also right?

2) And if a ideal gas is compressed slowly to 1/2 its origianl volume with no temp change then the avg speed also is 1/2.

i cant find where i read that at but working on these two problems i have i want to make sure that these 2 questions i am asking you guys are right so i can answer my two prblems i am working on.

Thanks!
Dx

Related Introductory Physics Homework Help News on Phys.org

#### dav2008

Gold Member
Heres the equation for average velocity of ideal gas molecules... U can take it from there

Vrms=[squ]3RT/M where M is molecular mass and R is 8.31

For the second one, if there is no temperature change, then there is no change in avg velocity since it is only dependant on temperature and the problem states that temperature is held constant

### Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving